$OpenBSD: patch-sim_ether_c,v 1.13 2012/07/10 00:07:45 sthen Exp $
--- sim_ether.c.orig	Fri Mar 30 16:30:26 2012
+++ sim_ether.c	Wed Jun 13 06:47:21 2012
@@ -1750,14 +1750,19 @@ strcpy(dev->name, savname);
 dev->dptr = dptr;
 dev->dbit = dbit;
 
-#if !defined(HAS_PCAP_SENDPACKET) && defined (xBSD) && !defined (__APPLE__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
 /* Tell the kernel that the header is fully-formed when it gets it.
    This is required in order to fake the src address. */
 if (dev->eth_api == ETH_API_PCAP) {
   int one = 1;
   ioctl(pcap_fileno(dev->handle), BIOCSHDRCMPLT, &one);
+#ifdef __OpenBSD__
+    /* set direction filter */
+    one = BPF_DIRECTION_OUT;
+    ioctl(pcap_fileno(dev->handle), BIOCSDIRFILT, &one);
+#endif /* __OpenBSD__ */
   }
-#endif /* xBSD */
+#endif /* __FreeBSD__ || __NetBSD__ || __OpenBSD__ */
 
 #if defined (USE_READER_THREAD)
 if (1) {
